Those without hearts. Originally human, and mutated by Ansem, these creatures seek and consume other's hearts, thus making more Heartless. They thrive on the hearts of different worlds, and destroy the worlds in the process. Greatly fear the Keyblade.

"Confound it Heartless! Why don't you leave us alone?" -D.Duck
"The Heartless have great fear for the Keyblade." -Leon

A girl that will reject you and say she still wants to be friends, even though your friendship with her isn't going anywhere and she won't let you be a closer friend.

Spenser: Wow. That's really nice of you but, I've always thought of you as a friend. It's not that I don't like you; I just don't like you in the same way that you like me. I am really sorry that we don't share the same feelings for each ohter; the last thing that I would want to do is upset you. Could it be enough if we were just friends? You are cool anf funny so I hope that this won't make it weird between us. There are still a lot of people who you could get to know and like more than me. I would like to complimate you for having the guts to tell me this. I have never told someone that I like them before. Once again, I am really sorry and I hope that we can still be friends.